Yep, it's honestly the epitome of release early and release often applied to something mission critical like a DB. By the time it's in a release, even the minimal version of a feature is pretty good quality, but just not necessarily the full-feature yet, so people can still test it and rely on it like it's a full stable feature missing minor features.
And if your patch adds a good feature but in a way that is bad architecturally then it will be rejected or fully rewritten with no care about what that means from a timing perspective.
It means that it takes awhile for things like parallel query to really become valuable but when they do you know they work and work well.